Three separate grass fires that were sparked near Grayson in Stanislaus County grew to about 300 acres Wednesday, as crews worked in difficult terrain to put out the flames.The containment on the three fires stands at 300 acres.The initial fire was sparked about 2 a.m. Tuesday near Cox and Grayson roads and was just five acres. It managed to jump containment lines, igniting two other fires before it was extinguished.One of those fires then ballooned to more than 200 acres Tuesday evening, and the third blaze stood at 60 acres, according to fire officials.Fireworks were heard in the area around the time the blaze started, and that may have caused the grass fire, investigators said.Crews are having a difficult time getting to the fire because of all the sand on the river bottom. Cal Fire helicopters made water drops on the flames.No further details have been released.

STANISLAUS COUNTY, Calif. (KCRA) —

Three separate grass fires that were sparked near Grayson in Stanislaus County grew to about 300 acres Wednesday, as crews worked in difficult terrain to put out the flames.

The containment on the three fires stands at 300 acres.

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The initial fire was sparked about 2 a.m. Tuesday near Cox and Grayson roads and was just five acres. It managed to jump containment lines, igniting two other fires before it was extinguished.

One of those fires then ballooned to more than 200 acres Tuesday evening, and the third blaze stood at 60 acres, according to fire officials.

Fireworks were heard in the area around the time the blaze started, and that may have caused the grass fire, investigators said.

Crews are having a difficult time getting to the fire because of all the sand on the river bottom. Cal Fire helicopters made water drops on the flames.